A method for implementing a hash map to improve performance consistency is disclosed herein. In one embodiment, such a method includes providing a hash map comprising a set of tables, the set of tables initially containing a first table. When the first table is full, the method augments the hash map by adding a second table to the set of tables. Similarly, when the second table is full, the method augments the hash map by adding a third table to the set of tables. A similar technique may be used to add additional tables to the hash map. When searching for a value in any of the tables in the hash map, the method uses the same hash code. A corresponding computer program product and apparatus are also disclosed herein.